Study on the technique of the time domain equalizer in OFDM systems
FU Yan zeng,ZHANG Hai lin,WANG Yu min (National Key Lab. of Integrated Service Networks, Xidian Univ., Xi′an 710071, China)
A new adaptive TEQ (time equalizer) design for Orthogonal Frequency Division Multiplex (OFDM) demodulation is presented. The TEQ is a simple finite impulse response filter (FIR) used in the receiver for shortening the total length of the effective channel impulse response to avoid using a very long cyclic prefix, so that the simple effective single complex tap per subchannel equalizer can be used. We give a new approach to obtaining the optimal TEQ coefficients fully using the essential property of OFDM modulation. The computer simulation results are also given.